ATI RN Dosage Calculation Exam
2025/2026
90 Minutes | 35 Questions | 100% Correct Answers
Section 1: Introduction
This document contains fully verified and 100% correct answers for the ATI RN Dosage
Calculation Exam, designed for the 2025/2026 exam cycle.
This exam consists of 35 math-based questions to be completed in 90 minutes, evaluating
essential skills required for safe medication dosing and administration.
Key focus areas include:
Conversions Between Units (Metric, Apothecary, Household)
Oral and Injectable Medication Dosage Calculations
IV Flow Rates and Infusion Time Calculations
Weight-Based and Pediatric Dosing
Safe Dose Range Calculations
Medication Reconstitution and Preparation
This A+ graded guide follows ATI’s precise format and helps ensure accurate clinical
calculations under pressure.
Section 2: Exam Questions and Answers
Format: Four answer choices per question (A–D). Correct answer highlighted. Questions
reflect ATI’s dosage calculation item types and real clinical scenarios.
Question 1
A nurse needs to convert 2 g to mg. What is the correct conversion?
A) 2000 mg
B) 200 mg
C) 20 mg
D) 2 mg
Correct Answer: A) 2000 mg
Rationale: 1 g = 1000 mg, so 2 g = 2000 mg.
Question 2
A prescription orders 0.5 g of a medication. The available dose is 250 mg tablets. How many
tablets should the nurse administer?
, A) 2 tablets
B) 1 tablet
C) 0.5 tablets
D) 4 tablets
Correct Answer: A) 2 tablets
Rationale: 0.5 g = 500 mg, 500 mg ÷ 250 mg/tablet = 2 tablets.
Question 3
A nurse is to administer 1000 mL of IV fluid over 8 hours. What is the flow rate in mL/hr?
A) 125 mL/hr
B) 100 mL/hr
C) 150 mL/hr
D) 80 mL/hr
Correct Answer: A) 125 mL/hr
Rationale: 1000 mL ÷ 8 hr = 125 mL/hr.
Question 4
A child weighs 22 kg and the medication dose is 4 mg/kg. What is the total dose?
A) 88 mg
B) 44 mg
C) 22 mg
D) 11 mg
Correct Answer: A) 88 mg
Rationale: 4 mg/kg × 22 kg = 88 mg.
Question 5
A medication has a safe dose range of 2-4 mg/kg/day. For a 15 kg child, what is the
maximum safe daily dose?
A) 60 mg
B) 30 mg
C) 15 mg
D) 45 mg
Correct Answer: A) 60 mg
Rationale: 4 mg/kg × 15 kg = 60 mg.
Question 6
A vial contains 1 g of medication to be reconstituted with 9 mL of sterile water, yielding 10
mL. What is the concentration in mg/mL?
A) 100 mg/mL
B) 50 mg/mL
C) 10 mg/mL
D) 200 mg/mL
Correct Answer: A) 100 mg/mL
Rationale: 1 g = 1000 mg, 1000 mg ÷ 10 mL = 100 mg/mL.
2025/2026
90 Minutes | 35 Questions | 100% Correct Answers
Section 1: Introduction
This document contains fully verified and 100% correct answers for the ATI RN Dosage
Calculation Exam, designed for the 2025/2026 exam cycle.
This exam consists of 35 math-based questions to be completed in 90 minutes, evaluating
essential skills required for safe medication dosing and administration.
Key focus areas include:
Conversions Between Units (Metric, Apothecary, Household)
Oral and Injectable Medication Dosage Calculations
IV Flow Rates and Infusion Time Calculations
Weight-Based and Pediatric Dosing
Safe Dose Range Calculations
Medication Reconstitution and Preparation
This A+ graded guide follows ATI’s precise format and helps ensure accurate clinical
calculations under pressure.
Section 2: Exam Questions and Answers
Format: Four answer choices per question (A–D). Correct answer highlighted. Questions
reflect ATI’s dosage calculation item types and real clinical scenarios.
Question 1
A nurse needs to convert 2 g to mg. What is the correct conversion?
A) 2000 mg
B) 200 mg
C) 20 mg
D) 2 mg
Correct Answer: A) 2000 mg
Rationale: 1 g = 1000 mg, so 2 g = 2000 mg.
Question 2
A prescription orders 0.5 g of a medication. The available dose is 250 mg tablets. How many
tablets should the nurse administer?
, A) 2 tablets
B) 1 tablet
C) 0.5 tablets
D) 4 tablets
Correct Answer: A) 2 tablets
Rationale: 0.5 g = 500 mg, 500 mg ÷ 250 mg/tablet = 2 tablets.
Question 3
A nurse is to administer 1000 mL of IV fluid over 8 hours. What is the flow rate in mL/hr?
A) 125 mL/hr
B) 100 mL/hr
C) 150 mL/hr
D) 80 mL/hr
Correct Answer: A) 125 mL/hr
Rationale: 1000 mL ÷ 8 hr = 125 mL/hr.
Question 4
A child weighs 22 kg and the medication dose is 4 mg/kg. What is the total dose?
A) 88 mg
B) 44 mg
C) 22 mg
D) 11 mg
Correct Answer: A) 88 mg
Rationale: 4 mg/kg × 22 kg = 88 mg.
Question 5
A medication has a safe dose range of 2-4 mg/kg/day. For a 15 kg child, what is the
maximum safe daily dose?
A) 60 mg
B) 30 mg
C) 15 mg
D) 45 mg
Correct Answer: A) 60 mg
Rationale: 4 mg/kg × 15 kg = 60 mg.
Question 6
A vial contains 1 g of medication to be reconstituted with 9 mL of sterile water, yielding 10
mL. What is the concentration in mg/mL?
A) 100 mg/mL
B) 50 mg/mL
C) 10 mg/mL
D) 200 mg/mL
Correct Answer: A) 100 mg/mL
Rationale: 1 g = 1000 mg, 1000 mg ÷ 10 mL = 100 mg/mL.
